ADALM2000 in GNURadioCompanion issue: ModuleNotFoundError: No module named 'm2k'

Hi,

there is a possibility that the ADALM2000 module was installed in other python package than the one GRC is using. Please check in /usr/local/lib/python3.8/dist-packages if there is any 'm2k' directory. Also check in python3 directory. If you found the 'm2k' module in python3 and not in python3.8, try to copy it and rerun GRC.

Please tell us if it works.

Thank you,

Teo

Thank you for the quick reply!

Yes I think your guess is in the right direction, but there is a new error message:

Traceback (most recent call last):
File "/home/christian/Documents/adalm2000/try1.py", line 29, in <module>
import m2k
File "/usr/local/lib/python3.8/dist-packages/m2k/__init__.py", line 34, in <module>
from .m2k_swig import *
File "/usr/local/lib/python3.8/dist-packages/m2k/m2k_swig.py", line 13, in <module>
from . import _m2k_swig
ImportError: /usr/local/lib/x86_64-linux-gnu/libgnuradio-m2k.so.0: undefined symbol: spi_init

Do you have any idea what else could be wrong?

Christian

Hi,

did you build gr-m2k with the digital interface enabled (-DDIGITAL=ON)? The function 'spi_init' is used only in the ADF4350 block, which is built only if the digital interface is on. If this is what you intended, then you must build libm2k with tools enabled (-DENABLE_TOOLS=ON). In gr-m2k the digital interface refers to digital parts (such as ADF4350), and not to the digital input/output interface (this one is built by default).

Please let us know if this was the problem.

Thank you,
Teo P.

Hi,

did you build gr-m2k with the digital interface enabled (-DDIGITAL=ON)? The function 'spi_init' is used only in the ADF4350 block, which is built only if the digital interface is on. If this is what you intended, then you must build libm2k with tools enabled (-DENABLE_TOOLS=ON). In gr-m2k the digital interface refers to digital parts (such as ADF4350), and not to the digital input/output interface (this one is built by default).

Please let us know if this was the problem.

Thank you,
Teo P.

Yes, thank, you, this seemed to be the problem.

My GnuRadio test graph is working now, hurray!

Christian

Well, just one additional question:

I still get the following warning, although I am using the blocks M2K Analog In Source and the M2K Analog Out Sink  

>>> Warning: This flow graph may not have flow control: no audio or RF hardware blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU congestion.

Why is that so; are these blocks no RF hardware blocks in the sense above?

M2K Analog In Source and the M2K Analog Out Sink are not RF blocks. The warning means that the data flow may consume a large percentage of your CPU cycles and in order to avoid that it suggests to add after the source block a throttle block.

Thanks!

The warning was fixed (github.com/.../41ee3b762de0ab6c6d18575d6c52b9111224c4a0). The throttle block is not required, and the warning will no longer appear. I would recommend not to use a throttle with M2k Analog In Source because it could cause data loss.